How di I add credit card entries manually?

Use MT Online or one of the converter tools (e.g csv2qbo) as a workaround.

https://www.moneythumb.com/?ref=110

Hi there. Just to add to the info provided by Fiat above, you can also follow this guide that shows you how to: Manually upload transactions into QuickBooks Online. You're more than welcome to ask other questions, I'm here to help.